Vane Rotary Compressor Bypass Hole for Pressure Regulation
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Solution Overview
Problem
The existing vane rotary compressors fail to quickly respond to pressure changes in the compression chamber, leading to reliability issues and a limited operation range, especially when using high-pressure refrigerants like R32, R410a, or CO2, due to the lack of a separate discharge passage other than outlet ports.
Innovation Solution
Incorporating a bypass hole, which is an additional discharge passage formed upstream of the outlet port, allowing for the quick discharge of refrigerant from the compression chamber before it reaches the outlet port, thereby preventing over-compression and maintaining proper pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate discharge passage (bypass hole) is added upstream of the outlet port, then the compressor can quickly respond to pressure changes and prevent over-compression, but the device complexity increases
Solution Approach 1:
The discharge function is segmented into two separate passages: the outlet port for normal discharge and the bypass hole for emergency pressure relief. This segmentation allows the system to handle different pressure conditions through dedicated pathways, improving reliability without requiring a completely redesigned discharge mechanism.
Solution Approach 2:
The bypass hole acts as an intermediary discharge passage that activates when pressure exceeds normal operating levels. It provides an intermediate relief path between the compression chamber and the discharge side, preventing over-compression before the refrigerant reaches the main outlet port.
2Quantity of substance
If the number of vanes is increased to reduce compression chamber volume, then cooling capability is maintained with high-pressure refrigerants, but pressure change in compression chamber is greatly generated causing frequent over-compression
Solution Approach 1:
The bypass hole is positioned upstream of the outlet port to provide preliminary pressure relief before the compression chamber reaches the outlet port. This preliminary action prevents over-compression by allowing excess pressure to escape early in the compression cycle, enabling the use of higher vane counts for improved cooling capability.
3Device complexity
If outlet ports are used as the only discharge passage, then the structure is simple, but pressure in compression chamber excessively rises when liquid refrigerant is suctioned or operating pressure increases
Solution Approach 1:
The discharge system is extended from a single radial outlet port to include an additional axial bypass hole dimension. This dimensional addition creates a dual-path discharge system that can handle pressure spikes and liquid slug conditions without requiring complete structural redesign of the original simple outlet port system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances the reliability of the compressor and expands its operation range by enabling rapid pressure regulation and preventing over-compression, especially when using high-pressure refrigerants, ensuring efficient and stable operation.
Implementation Method 1
a bypass hole, which is an additional discharge passage formed upstream of the outlet port, allowing for the quick discharge of refrigerant from the compression chamber before it reaches the outlet port
Data Source
AI summary
A vane rotary compressor may include a cylinder provided with at least one outlet port; a plurality of bearings coupled to both sides of the cylinder in an axial direction of the cylinder to form a compression space together with the cylinder; a rotational shaft radially supported by the plurality of bearings; a roller rotatably coupled to the rotational shaft and provided with a plurality of vane slots formed in a circumferential direction, each having a first end opened to an outer circumferential surface thereof; a plurality of vanes slidably inserted into the plurality of vane slots of the roller, respectively, and protruding toward an inner circumferential surface of the cylinder to partition the compression space into a plurality of compression chambers, respectively; a discharge valve coupled to the cylinder to open and close the at least one outlet port; and at least one bypass hole formed in at least one of the plurality of bearings or formed in the cylinder to bypass a portion of refrigerant compressed in the compression chamber.